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    Materials design for ceramic oxygen permeation membranes: Single perovskite vs. single/double perovskite composite, a case study of tungsten-doped barium strontium cobalt ferrite

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    Authors
    Zhang, J.
    Zhang, Z.
    Chen, Y.
    Xu, X.
    Zhou, C.
    Yang, G.
    Zhou, W.
    Shao, Zongping
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, J. and Zhang, Z. and Chen, Y. and Xu, X. and Zhou, C. and Yang, G. and Zhou, W. et al. 2018. Materials design for ceramic oxygen permeation membranes: Single perovskite vs. single/double perovskite composite, a case study of tungsten-doped barium strontium cobalt ferrite. Journal of Membrane Science. 566: pp. 278-287.
    Source Title
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2018.09.004
    ISSN
    0376-7388
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/72412
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. Pure oxygen is an important raw material with many important applications. The production of oxygen via a conducting ceramic membrane is a new, cost-effective and advanced technology with the advantage of continuous oxygen production. The perovskite-type mixed-conducting oxide Ba0.5Sr0.5Co0.8Fe0.2O3-d (BSCF) exhibits superb oxygen permeability, yet it suffers from poor phase stability. In this study, we aim to improve the operational stability of the BSCF membrane by introducing a high-valence W6+ ion as a B-site dopant. Its effect on the phase composition, structure, structural stability, electrical conductivity, oxygen transfer rate and oxygen permeability as a membrane is systematically investigated. Upon the partial substitution of cobalt and iron in the W6+-doped BSCF, single/double perovskite composites are formed instead of single perovskite composites. Remarkably, the formation of the single/double perovskite composites enhances the oxygen permeation stability without obviously compromising the oxygen permeability. Among the various materials, the composite with the nominal composition of Ba0.5Sr0.5Co0.8Fe0.1W0.1O3-d shows the best performance in terms of stability and oxygen permeability. These findings thus introduce a new way to design conducting ceramic membranes for oxygen separation at high temperatures.

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